(Possibly related to MC-12596)
In a particular area of my minecart railroad, I keep getting a large amount of lag. 'root.tick.connection.checkLight' keeps eating up all the CPU time, resulting in video for half a second, followed by two seconds of video being frozen.
The area has not always behaved like this.
The associated save has you travelling south by minecart, nearing a right turn to the west (which heads to my base). The lag seems to occur mainly on the north-south segment, though orientation probably has nothing to do with the issue.
A good amount of the rail is underwater, though the lag also occurs above sea level.
I believe the minecart is unrelated to the issue - IIRC I once got out and still had the lag.
The savegame, too large to upload, is located at
Environment
Minecraft Version: 1.5.1
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_09, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 293108792 bytes (279 MB) / 495517696 bytes (472 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 17293 (968408 bytes; 0 MB) allocated, 3 (168 bytes; 0 MB) used
Suspicious classes: No suspicious classes found.
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
LWJGL: 2.4.2
OpenGL: AMD Radeon HD 7520G GL version 4.2.11480 Compatibility Profile Context, ATI Technologies Inc.
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: 12173 (681688 bytes; 0 MB) allocated, 20 (1120 bytes; 0 MB) used
Attachments
Comments 4
Okay, please mark as invalid, resolved, or whatever. Updating the Java seems to have fixed it. Walked and rode the length without significant time in root.tick .
Could reproduce with your world but with current Java 7U17, even when digging from the tunnel straight upwards over the ocean.
Related to MC-17203?
Just realised my Java is outdated, updating it, will check again.